Which activity is most likely to produce heat from friction? A ) Opening a window

B ) Turning on a water faucet.

C ) Putting a pot of water on a hot plate.

D ) Rubbing an eraser back and forth over a piece of paper.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

answer carbon and three oxygen atoms;